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Microchip Technology AT26DF161A-SSU
- Part No.:
- AT26DF161A-SSU
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AT26DF161A-SSU.pdf
- Description:
- IC FLASH 16MBIT SPI 70MHZ 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,909
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Product details
Overview
AT26DF161A-SSU from Adesto Technologies (now part of Dialog Semiconductor) is a 16-Mbit serial Flash memory IC designed for code shadowing and data storage in embedded systems. It operates from a single 2.7V–3.6V supply, supports SPI Modes 0/3 up to 70 MHz, and features uniform 4/32/64-Kbyte erase blocks plus 100,000 program/erase cycles - enabling reliable firmware updates in industrial controllers and IoT edge nodes.
For engineers reviewing the AT26DF161A-SSU datasheet, AT26DF161A-SSU pinout, AT26DF161A-SSU application, or AT26DF161A-SSU equivalent, key selection criteria include sector protection granularity, deep power-down current (10 µA), JEDEC-compliant ID read, and compatibility with 3.3V-only host microcontrollers requiring deterministic erase timing and hardware write protection via WP/HOLD pins.
Technical Context
The AT26DF161A-SSU implements a SPI-compatible interface with rising-edge input latch (SI, CS, WP, HOLD) and falling-edge output clocking (SO), supporting both high-speed (0Bh) and low-frequency (03h) read modes. Its internal architecture includes a 16-Mbit Flash array segmented into thirty-two 64-Kbyte physical sectors, each individually lockable via hardware-controlled WP pin or software commands.
Erase operations are fully self-timed and validated by status register polling: Block Erase (20h/52h/D8h) targets 4/32/64-Kbyte regions aligned to natural boundaries, while Chip Erase (60h/C7h) clears the full array. Programming uses Byte/Page (02h) or Sequential Mode (ADh/AFh), with automatic EPE bit flagging for failed writes and WEL bit management ensuring atomic command execution.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 16 Mbit (2 MByte) - sufficient for boot code + configuration + logging in resource-constrained MCU systems |
| Supply Voltage | 2.7V–3.6V - compatible with standard 3.3V logic rails without level-shifting or auxiliary supplies |
| Max Clock Frequency | 70 MHz - enables fast sequential reads (e.g., code shadowing) with tRC ≤ 14 ns |
| Erase Granularity | 4/32/64-Kbyte blocks + full chip - allows precise firmware patching without erasing unrelated data sectors |
| Endurance & Retention | 100,000 cycles / 20 years - meets industrial lifecycle requirements for field-upgradable devices |
| Deep Power-down | 10 µA typical - reduces system standby power in battery-backed or energy-harvested nodes |
| Operating Temperature | −40°C to +85°C - qualified for industrial-grade embedded applications without derating |
Pinout & Package
AT26DF161A-SSU is packaged in an 8-lead SOIC (208-mil wide), RoHS-compliant and halogen-free. Pin functions are electrically defined per JEDEC MS-012, with no internal pull-ups on CS/SCK/SI/SO and internal weak pull-ups on WP and HOLD.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-low enable signal; rising edge terminates all operations and places SO in high-Z state |
| SCK | Serial Clock | Input clock controlling data transfer timing; rising edge latches SI, falling edge clocks SO |
| SI | Serial Input | Command, address, and data input line; MSB-first, synchronous to SCK rising edge |
| SO | Serial Output | Data output line; MSB-first, driven on SCK falling edge during read/status operations |
| WP | Write Protect | Hardware lock for protected sectors; low = enable protection; internally pulled high |
| HOLD | Hold Control | Pauses ongoing SPI transfers without deselecting device; low = suspend communication |
| VCC | Power Supply | Primary 2.7–3.6V supply; powers core logic, Flash array, and I/O buffers |
| GND | Ground Reference | System return path for VCC and all signal currents; must be low-impedance connection |
Key Features
| Feature | Design Value |
|---|---|
| Flexible Erase Architecture | Four granularities (4/32/64-Kbyte + full chip) minimize wasted space when updating partial firmware modules |
| Individual Sector Protection | 32 × 64-Kbyte sectors can be locked/unlocked independently - isolates boot code from user data partitions |
| Hardware Write Locking | WP pin provides tamper-resistant, non-volatile sector locking independent of software state or power loss |
| Sequential Program Mode | ADh/AFh opcodes eliminate repeated address transmission for consecutive byte writes - cuts SPI bus overhead by >60% vs. discrete byte programming |
| Automatic Failure Reporting | Status register EPE bit flags failed program/erase operations in real time - enables robust error recovery in safety-critical firmware updates |
Applications
| Industrial PLC Firmware Storage | Medical Device Configuration Memory |
|---|---|
Use Scenario: Storing and updating ladder logic programs and I/O mapping tables in programmable logic controllers deployed in factory automation environments. IC Role / Device Role / Timing Role: Nonvolatile code storage with sector-level protection - boot loader resides in globally protected sector; application logic updated in isolated 64-Kbyte sectors. Use Value: Enables field firmware upgrades without risk of corrupting critical boot code; 100K-cycle endurance supports decades of scheduled maintenance cycles. | Use Scenario: Retaining calibrated sensor offsets, patient history logs, and regulatory compliance settings in portable diagnostic equipment operating under strict IEC 62304 requirements. IC Role / Device Role / Timing Role: Secure, long-retention data archive - individual 64-Kbyte sectors store distinct data classes (calibration, logs, audit trail) with hardware-enforced write locks. Use Value: Prevents accidental or malicious overwrite of calibration data; deep power-down mode extends battery life between clinical sessions. |
| Smart Energy Meter Boot Code | Automotive Telematics OTA Storage |
Use Scenario: Hosting secure boot firmware and cryptographic keys in ANSI C12.22-compliant electricity meters exposed to wide temperature swings and EMI. IC Role / Device Role / Timing Role: Primary boot memory with Global Protect enabled at manufacturing - ensures immutable first-stage bootloader integrity across 20-year service life. Use Value: Meets ANSI/IEEE 1374.1 anti-tampering requirements; industrial temp range (−40°C to +85°C) guarantees operation in outdoor meter enclosures. | Use Scenario: Storing signed firmware images and delta update patches in cellular-connected vehicle telematics control units (TCUs) performing over-the-air (OTA) updates. IC Role / Device Role / Timing Role: Dual-bank update staging memory - one 64-Kbyte sector holds active firmware, adjacent sector receives verified patch before atomic swap. Use Value: 4-Kbyte erase granularity enables rapid patch application without full image reflash; 70 MHz SPI speed reduces OTA downtime. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial Flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT25DF161-SSHN-T | Same 16-Mbit density, 2.7–3.6V supply, and SPI interface but with enhanced security features including OTP lock bits and secure OTP area | Better suited for applications requiring cryptographic key storage or firmware authenticity verification | Select when hardware-based secure boot or anti-cloning is required; not drop-in due to additional security registers |
| SST25VF016B-80-4I-SAE | 16-Mbit, 2.7–3.6V, SPI-compatible but lacks HOLD pin and has slower max clock (80 MHz vs. 70 MHz actual usable rate) | Compatible for basic code storage where hold functionality is unused and timing margins are relaxed | Consider for cost-sensitive designs where sector protection granularity and deep power-down are secondary |
Compared with AT26DF161A-SSU, AT25DF161-SSHN-T adds security primitives at the expense of minor command set divergence, while SST25VF016B-80-4I-SAE trades advanced protection features for broader legacy SPI controller compatibility - making AT26DF161A-SSU optimal for balanced industrial firmware/data storage where sector-level hardware locking and low standby power are mandatory.
Availability
AT26DF161A-SSU is available at Aetrix Electronics and suitable for industrial PLCs, medical diagnostics, smart energy meters, and automotive telematics requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for AT26DF161A-SSU includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Adesto Technologies, acquired by Dialog Semiconductor in 2020, specialized in low-power, high-reliability nonvolatile memory solutions for industrial and IoT applications.
The AT26DF161A-SSU belongs to Adesto's DataFlash® family - engineered specifically for embedded systems needing efficient code shadowing and robust data logging with minimal power and board space.
FAQ
What is the maximum SPI clock frequency supported by the AT26DF161A-SSU?
The AT26DF161A-SSU supports a maximum clock frequency of 70 MHz for high-speed read operations using the 0Bh opcode. This enables fast sequential access for code shadowing. Lower-frequency reads (up to fRDLF) use the 03h opcode. The device complies with SPI Modes 0 and 3, with data latched on the rising edge of SCK and output on the falling edge. Timing parameters are fully specified in the official datasheet revision 3640D.
Does the AT26DF161A-SSU require a separate voltage for programming or erasing?
No, the AT26DF161A-SSU performs all read, program, and erase operations using only the main VCC supply (2.7V–3.6V). There is no requirement for a higher programming voltage or auxiliary charge pump supply. This simplifies power design in 3.3V systems and eliminates external voltage translation circuitry - a key advantage over older parallel or multi-voltage Flash devices.
How does hardware write protection work on the AT26DF161A-SSU?
Hardware write protection on the AT26DF161A-SSU is controlled by the WP pin, which enables physical locking of individually protected sectors. When WP is asserted low, protected sectors cannot be modified via any software command (including program/erase), even if the Write Enable Latch (WEL) is set. The WP pin is internally pulled high, so it may be left floating if unused - though external connection to VCC is recommended for noise immunity.
Can the AT26DF161A-SSU be used in place of the AT25DF161 in new designs?
No - the AT26DF161A-SSU is explicitly marked "For New Designs Use AT25DF161" in its official documentation. While functionally similar, the AT25DF161 offers enhanced security features (OTP lock bits, secure area), improved reliability metrics, and extended product longevity. The AT26DF161A-SSU remains viable for legacy designs or cost-sensitive applications where those enhancements are unnecessary, but Adesto recommends AT25DF161 for all new implementations.
What package options are available for the AT26DF161A-SSU?
AT26DF161A-SSU is offered in two RoHS-compliant, halogen-free packages: 8-lead SOIC (208-mil wide, suffix -SSU) and 8-pad MLF (6 × 5 × 1.00 mm, suffix -MHN). The -SSU variant is pin-compatible with industry-standard 208-mil SOIC footprints and supports reflow soldering per J-STD-020. Both packages meet full industrial temperature range (−40°C to +85°C) and JEDEC moisture sensitivity level 3.
AT26DF161A-SSU Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- FLASH
- Technology:
- FLASH
- Memory Size:
- 16Mbit
- Memory Organization:
- 256 Bytes x 8192 pages
- Memory Interface:
- SPI
- Clock Frequency:
- 70 MHz
- Write Cycle Time - Word, Page:
- 7µs, 5ms
- Access Time:
- -
- Voltage - Supply:
- 2.7V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
AT26DF161A-SSU FAQ
1.How can I place an order for AT26DF161A-SSU through Aetrix?
Please submit a Request for Quotation (RFQ) for AT26DF161A-SSU on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for AT26DF161A-SSU reliable?
The price and inventory of AT26DF161A-SSU are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT26DF161A-SSU is usually 5 days.
3.What payment methods are accepted for AT26DF161A-SSU?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT26DF161A-SSU transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT26DF161A-SSU?
AT26DF161A-SSU orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT26DF161A-SSU order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for AT26DF161A-SSU?
For technical support, including AT26DF161A-SSU datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT26DF161A-SSU requirements.
6.How does Aetrix verify that AT26DF161A-SSU is sourced from the original manufacturer or authorized distributors?
All AT26DF161A-SSU products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that AT26DF161A-SSU meets industry standards.
7.What is the process for return or replacement of AT26DF161A-SSU?
All AT26DF161A-SSU units undergo pre-shipment inspection (PSI). If there is an issue with AT26DF161A-SSU, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The AT26DF161A-SSU part is unused and in its original packaging.
Return procedure for AT26DF161A-SSU:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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